Kaisai KOU-12HFN1-QRC8, Service Manual

Page: 152 / 170

Troubleshooting
148 Electrical Control System
2.4.4.9. P1 malfunction
(For 36k models)
P1 display
High pressure protection
Judge 1: Whether the wiring
between the high pressure
switch and main control
board is connected well or
correctly
Method: Short connect the
high pressure protector
socket, check whether the
system can run normally
Yes
No
Connect it well
Replace outdoor main board
No
Replace high pressure protector Yes
Judge 2: Whether
the high pressure
protector is broken
Check whether
the refrigerant
system is ok
Judge 3: Check whether the
outdoor ambient
temperature is higher than
50
℃
No
Stop the unit Yes
Judge 4: Check whether the
outdoor unit is bad
ventilation
No
Make the outdoor unit ventilate well Yes
Judge 5: Check whether the
heat exchanger is dirty
Clean the heat exchanger Yes
Judge 6: Check whether the
refrigerant pipe is blocked
Let the refrigerant out, then use the
high pressure nitrogen or refrigerant to
blow pipe, vacuumize and charge the
refrigerant again
Yes